U. S. DEPARTMEN 1 OF AGRICULTURE. 



BUREAU OF PLANT INDUSTRY— BULLETIN NO. 36. 



B. T. GALLOWAY, Chief of Bureau. 



THE '-BLUING" AND THE "RED HOT" OF THE WESTERN 



YELLOW PINE, WITH SPECIAL REFERENCE TO 



THE BLACK HILLS FOREST RESERVE. 



BY 



HERMANN VON SCHRENK, 



Special Agent ix Charge of the Mississippi Valley 



Laboratory, 



vegetable pathological and physiological i n^estigations. 



IssLEi) May •^. ^90^. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



19 3. 



